Drill steel retainer



y 1935- w. A. SMITH. JR. ET AL 2,047,651

DRILL STEEL RETAINER Filed March 16, 1954 FI /22.14.5021??? :17? azzd if. J. ST/Z0116 I N VEN TORS ATTORNEY Patented July 14, 1936 DRILL STEEL lemma William A. Smith, J r., North Arlington, N. J and Herman J. Schorle, Astoria, Long Island, N. Y., assignors to Worthington Pump and Machinery Corporation, New York, N. Y., a corporation of Virginia Application March 16, 1934, Serial No. 715,884

2 Claims.

This invention relates to rock 'drills or analogous percussive tools and more particularly to drill steel retainers therefor.

An object of the invention is to provide a drill steel retainer which will prevent ejection of the drill steel from the front head of the drill during operation, one which is rugged in construction and which may be quickly and easily moved into or out of drill steel retaining position.

With these and other objects in view as may appear from the accompanying specification, the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawing, showing drill steel retainers of the preferred form, and the features forming the invention will be specifically pointed out in the claims.

In the drawing:

Fig. 1 is a side elevation partly in section of the improved drill steel retainer.

Fig. 2 is a longitudinal section through the drill steel retainer taken on the line 2-2 of Fig. 1.

Fig. 3 is a cross section through the retainer taken on the line 3--3 of Fig. 1.

Referring more particularly to the drawing, the front head of any approved type of rock drill or percussive tool is shown at I which front head receives in its forward openv end the collared drill steel 2. The drill steel 2 has the usual form of collar 3 formed thereon which cooperates with the drill steel retainer in preventing the drill steel from being ejected from the drill during operation. 7

The front head I has a pair of trunnions 5 formed thereon and projecting laterally therefrom on which trunnions are swingably hung the retainer bolts 6. There are two of. the retainer bolts 6 and they are of similar construction. Each of the retainer bolts 6 comprises a head 1 which is rockably mounted upon the trunnion 5 to permit swinging of the bolt and of the yokelike retainer proper 8. The yoke-like retainer 8 is substantially U-shaped and has heads 9 formed on the front ends of its legs which heads receive Shock-absorbing springs I l are mounted about the retainer bolts 6, are tensioned by nuts l2 and engage the outer sides of the heads 9 so as to provide yieldableshock-absorbing connection between the drill steel retainer and the drill proper through the medium of the retainer bolts 6.

The retainer bolts 6 have steadying or supporting rod extensions l4 formed thereon which project outwardly from the nuts l2 and extend through suitable ears l5 formed on the retainer 8 adjacent to the retaining head In. The rods M are slidable in the ears i5 and they serve to steady and support the retainer 8.

The trunnions 5 have flattened surfaces It and I! formed thereon at acute angles to each other which flat surfaces are engaged by the latch or looking plunger I8 to hold the retainer either in steel retaining position or out of steel retaining position. The spring l9 engages the plunger l8 for urging it in looking position.

In the drill steel retainer illustrated in the drawing and just described, the springs H act only as shock absorbers and it is not necessary to overcome the tension of these springs to move the retainer 8 out of steel retaining position; therefore, the retainer may be easily moved from one position to the other and it is retained in such position by means of the retainer-bolt carried latches I8 while it is held steady in position by the support or steadying rod extensions I4.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that they may be widely modified within the invention defined by the claims.

What is claimed is:

1. In a percussive tool, the combination with a front head adapted to receive the collared shank of a drill steel and having laterally extending trunnions thereon, retainer bolts swingably carried by said trunnions, a substantially U- shaped retainer including leg portions and a retainer head and having laterally extending eyes at the ends of its leg portions, said eyes slidably engaging upon said retainer bolts, nuts threaded on said bolts, springs between said nuts and said eyes, ears formed upon the retainer head of said substantially U-shaped retainer and projecting laterally therefrom, and extensions formed upon said swingable bolts projecting outwardly from said nuts and extending slidably through said ears.

2. In a percussive tool, the combination with a front head adapted to receive the collared shank of a drill steel and having laterally extending trunnions thereon, retainer bolts swingably carried by said trunions, a substantially U-shaped retainer including leg portions and a retaining head for engagement with a drill steel, said retainer having laterally extending eyes at the ends of its leg portions which slidably engage upon said retainer bolts, nuts threaded on said bolts, springs between said nuts and eyes, laterally extending ears formed upon said retaining head and projecting laterally therefrom, exten- WILLIAM A. SMITH, JR. HERMAN J. SCHORLE. 

